The Quality Assurance Plan should include a list of all required welding inspections and identify the responsible party for each task. The Contractor (the Manufacturer or the Erector), the Special Inspector, the Welding Inspector, or the Nondestructive Testing Technician may provide inspections. Depending on the severity of loading (Seismic Weld Demand Categories) on a weld …
Pitot tube is a device used to measure the fluid flow measurement invented by Henri Pitot, a French engineer in 18th century. It is widely to measure the airspeed of aircrafts, speedboat speed and for fluid flow measurement in industrial application. Pitot tube measures the pressure point in contact.  Principle: The pitot tube is a differential …
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What is Direct Acting ? Â Direct acting means that valves uses a power supply to open and close. Power is transformed into magnetic force,in a plunger type valve,forces a plunger to move and open or close the valve seats. Other direct acting valve operate without a plunger but with same principle of direct power …
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Thermocouple Gauge Thermocouple gauge is a device used to measure low vacuum.Working of a Thermocouple GaugeIn Thermocouple Gauge a filament is heated by passing constant current through it.When gas molecule interact with filament heat is carried away.Therefor the temperature is directly depended on the pressure in the chamber.The higher the pressure the more molecule interact with …
Pirani GaugePirani gauge is a device used to measure low vacuum in a pressure range from 0.5 Torr to 10−4 Torr. Working Principle and Construction of Pirani gauge Pirani gauge consist of two tungsten filaments,a power source and a volt meter or ammeter.One of the filaments is placed to gauge tube and is exposed to the environment where the pressure …
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What is a Load Cell?Load cell is a device that converts force in to an electrical signal.A load sensor is a sensor or a transducer that converts a load or force acting on it into an electronic signal.This electronic signal can be a voltage change,current change or frequency change depending on the type of load …
How Differential Flow Meter Works? The differential flow meter is the most common device for measuring fluid flow through pipes. Flow rate and pressure differential of fluids such as gases,vapors and liquids are explored using the orifice plate flow meter. The differential flow meter venuri tube,flow nozzle or orifice plate is an inline instrument,that is …
Electrical Protective Device A device used to protect equipment,machinery,components and devices,in electrical and electronic circuit,against short circuit,over current and earth fault,is called as protective devices. Necessity of Protective Devices Protective devices are necessary to protect electrical appliance or equipment against a)Short Circuit b)Abnormal variations in the supply voltage c)Overloading of equipment d)To protect operator against …
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The differences between circuit breakers and fuses. Both residential and industrial electronics circuits systems require some form of protection to prevent catastrophic failure circuit damage or loss of life due to excessive current brought on by a short circuit overload device failure or other unforeseen elements. The two most common forms of circuit protection are fuses and …
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While reading the instrument specification or electrical equipment specification you might have seen IP classes.IP is interpreted as Ingress protection.Ip calsses stands for specifying the environmental protection of electrical equipments. With ingression protection class we can understand, an instrument can withstand in which environmental condition. While selecting the instrument it is important to consider the …